Core to ultracompact HII region evolution in the W49A massive protocluster T. Nony, R. Galván-Madrid, N. Brouillet, G. Suárez, F. Louvet, C. G. De Pree, M. Juárez-Gama, A. Ginsburg, K. Immer, Y. Lin et al. (3 more) A&A, 687 (2024) A84 Published online: 01 July 2024 DOI: 10.1051/0004-6361/202449279